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Note 8 - Goodwill and Intangible Assets - Intangible Assets and Related Accumulated Amortization (Details) - USD ($) $ in Millions	Jun. 30, 2023	Dec. 31, 2022
Cost	$ 972.4	$ 927.1
Accumulated amortization	(464.4)	(422.3)
Net	$ 508.0	$ 504.8
Technology-Based Intangible Assets [Member]
Weighted average useful life (Year)	8 years	8 years
Cost	$ 369.3	$ 355.1
Accumulated amortization	(245.8)	(229.3)
Net	$ 123.5	$ 125.8
Marketing-Related Intangible Assets [Member]
Weighted average useful life (Year)	6 years	6 years
Cost	$ 42.6	$ 41.3
Accumulated amortization	(37.4)	(35.5)
Net	$ 5.2	$ 5.8
Contract-Based Intangible Assets [Member]
Weighted average useful life (Year)	6 years	6 years
Cost	$ 5.0	$ 5.0
Accumulated amortization	(5.0)	(5.0)
Net	$ 0.0	$ 0.0
Customer-Related Intangible Assets [Member]
Weighted average useful life (Year)	13 years	13 years
Cost	$ 540.3	$ 510.7
Accumulated amortization	(169.3)	(146.7)
Net	$ 371.0	$ 364.0
Database [Member]
Weighted average useful life (Year)	8 years	8 years
Cost	$ 15.2	$ 15.0
Accumulated amortization	(6.9)	(5.8)
Net	$ 8.3	$ 9.2

X

- Definition

Useful life of finite-lived intangible assets, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

+ References

No definition available.

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- Definition

Accumulated amount of amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 210
-SubTopic 10
-Name Accounting Standards Codification
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(16))
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Topic 350
-SubTopic 30
-Name Accounting Standards Codification
-Section 50
-Paragraph 2
-Subparagraph (a)(1)
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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- Definition

Amount before amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 928
-SubTopic 340
-Name Accounting Standards Codification
-Section 50
-Paragraph 1
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483147/928-340-50-1

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-Section 50
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-URI https://asc.fasb.org//1943274/2147482665/350-30-50-2

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- Definition

Amount after amortization of assets, excluding financial assets and goodwill, lacking physical substance with a finite life.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Topic 926
-SubTopic 20
-Name Accounting Standards Codification
-Section 50
-Paragraph 5
-Publisher FASB
-URI https://asc.fasb.org//1943274/2147483154/926-20-50-5

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